Dominator,
Up until the Falklands affair in 1982 NONE of the RAF Hercules or Nimrods were AAR equipped. The VC10, Argosy and Belfast all had AAR provision removed not long after introduction as it simply was never needed. The Nimrod R1 fleet was also never AAR equipped until the Falklands. AAR was removed from the Vulcan force as it was never needed up until 1982.
All of these mods were made purely for the South Atlantic prior to Mount Pleasant opening.
I can see a case for the E-7 to be AAR capable, and maybe the P-8A, but the C-17? Rivet Joint? Even the Voyager AAR fleet can't refuel.